Many Beliebers thought they were enjoying a quiet Saturday evening until an unexpected track from Justin Bieber appeared on OVO Sound Radio.

Perhaps the biggest surprise, however, came when the single featured his ex-girlfriend Selena Gomez.

Titled "Strong," the song can be described as a stripped-down duet that has lyrics fans will likely be talking about for quite some time.

"What should I do? Should I go? / Who do I talk to? Nobody knows," Bieber asked in the track. Gomez is later heard singing, "Wishing I was better at this damn thing / Cause it's just been too long and I can't change."

Both singers haven't commented on the track and no official word on if the song will be featured on Bieber's upcoming album, Purpose, out Nov. 13.

In recent weeks, both Gomez and Bieber have talked openly about their past relationship in separate interviews. While opening up to the New York Times, the "Same Old Love" crooner admitted that she is rooting for her ex's comeback.

"While people were writing that I was stupid for being in [the relationship], this is what I always saw in him," she shared. "I'm like, duh!"

Meanwhile, Bieber can't help but remember the good times he shared with the former Disney star.

"We were so in love. Nothing else mattered," he explained in Complex magazine. "We were all about each other. But when it's like that and you get your value from that, people will always disappoint you. Your girl or your dude, they're always going to disappoint you."